Special Issue Information

Dear Colleagues,

Holographic principle, which is inspired by the expression for the entropy of black holes, states that in theories with gravity, physics of any region of space is encoded in the information on the boundary of this region. The general idea of holography found a specific realization in the gauge/gravity duality, which postulates an equivalence between string theory (quantum gravity) on a space and field theory on the boundary of that space. Over the last two decades gauge/gravity duality has led to important breakthroughs in different fields, from physics of strong interactions and black holes to theories of superconductivity and quantum phase transitions.

For this special issue we welcome manuscripts related to the holographic principle, gauge/gravity duality, and their applications to quantum gravity, strong interactions, and condensed matter physics.

Prof. Dr. Kazuharu BambaProf. Dr. Oleg LuninGuest Editors

Submission

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. Papers will be published continuously (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are refereed through a peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Entropy is an international peer-reviewed Open Access monthly journal published by MDPI.

Abstract: The thermodynamic behaviors of a system living in a curved space-time are different from those of a system in a flat space-time. We have investigated the thermodynamics for a system consisting of relativistic massless bosons. We show that a strongly curved metric will produce a large enhancement of the degrees of freedom in the formulae of energy and entropy of the system, as a comparison to the case in a flat space-time. We are mainly concerned with its implications to holography, including the derivations of holographic entropy and holographic screen.

Planned Papers

The below list represents only planned manuscripts. Some of these
manuscripts have not been received by the Editorial Office yet. Papers
submitted to MDPI journals are subject to peer-review.

Type of the Paper: ReviewTitle: Holographic Approach to Super Yang Mills Theory in Cosmological BackgroundAuthors: Kazuo Ghoroku, Akihiro Nakamura, Masafumi Ishihara and Fumihiko ToyodaAbstract: We review an holographic approach to the ${\cal N}=4$ supersymmetric Yang-Mills (SYM) theory, which is embedded in the Friedmann-Robertson-Walker (FRW) type background. The dual supergravity solutions are characterized by the dark energy (4D cosmological constant (cc)) and the dark radiation (gluon fluid). It is shown how the 4D background geometry, or 4D cc and the dark radiation, controls the dynamical properties of the SYM. In the parameter plane of 4D cc and the dark radiation, a rich phase structure of the SYM theory is seen, and new aspects of AdS/CFT correspondence are also shown through our supergravity solution.